How to Fill Out and File Form CT-3: Parts, Apportionment, MTA Surcharge

To file Form CT-3, New York’s general business corporation franchise tax return, you start from your completed federal Form 1120, apply New York additions and subtractions to arrive at entire net income, apportion that income based on where your customers are, compute tax under three separate bases and pay whichever is highest, then e-file the return with the Department of Taxation and Finance by the three-and-a-half-month deadline (April 15 for calendar-year filers).

Confirm CT-3 Is the Right Form for You

Any domestic corporation organized under New York law owes the franchise tax simply for holding a corporate charter, whether or not it conducted business or earned revenue during the year.¹ Foreign corporations file CT-3 when they do business in New York, employ capital here, own or lease property, keep an office, or derive receipts from in-state activity.²

A few corporations use a different return. New York S corporations file Form CT-3-S once their S election has been approved.³ Insurance corporations file under Article 33.⁴ Transportation and transmission corporations file under Article 9.⁵ Dormant domestic corporations still file CT-3 every year; skipping the return can lead to dissolution by proclamation.

What to Gather Before You Start

Form CT-3 builds on your federal return, so finish that first. You must attach a complete copy of your federal Form 1120 (or applicable 1120-series return) to the CT-3.⁶ Have the following ready:

Your EIN and the NAICS code for your principal activity from NYS Publication 910.
Receipts broken down by location (New York versus everywhere) and by category: tangible goods, services, rentals, royalties, digital products, financial instruments, and others.
Payroll records showing total New York wages and full-time employee count.
Asset and liability schedules, with real property and marketable securities at fair market value and other property at book value.
Depreciation schedules under both federal and New York rules, since the two can differ for certain assets.

Download the current year’s form and instructions from the Department’s website before you begin. The instructions run long, and the line-by-line guidance there governs anything a summary leaves out.

Working Through the Seven Parts

The return is organized into seven parts that feed each other.⁷ The practical order is to fill in Parts 1, 3, 4, 5, 6, and 7 first, then let Part 2 pull their results together.

Part 1: General Information

Section A is where you claim preferential tax status: qualified New York manufacturer, qualified emerging technology company, qualified small business, cooperative housing corporation, or qualified New York innovation hot spot entity. These boxes change which rates apply through the rest of the return, so verify eligibility before checking any. Section B gathers New York operating data such as employee headcount, in-state wages, business locations, and whether you make related-party royalty payments requiring an addback. Section C sets your filing type and identifies which federal return you’re attaching.

Part 3: Business Income Base

Begin with federal taxable income before the net operating loss deduction and special deductions, then apply the New York additions and subtractions described below. The result is entire net income. Multiply that by the business apportionment factor from Part 6 to produce apportioned business income, then apply the appropriate tax rate.

The standard rate is 6.5 percent. Corporations with business income over $5 million pay 7.25 percent for tax years beginning before January 1, 2027. Qualified New York manufacturers and qualified emerging technology companies pay zero percent on the business income base.

Two separate loss items appear in this part, and the Department flags their confusion as a recurring error. The prior net operating loss conversion (PNOLC) subtraction goes on line 16. The net operating loss deduction (NOLD) goes on line 18. Neither applies if apportioned business income on line 15 is already zero or negative.⁸

Part 4: Capital Base

Business capital equals total assets (excluding investment capital and your own stock) minus liabilities not already offset against investment capital. Enter real property and marketable securities at fair market value and other property at book value. Multiply total business capital by the apportionment factor and then by 0.1875 percent. The capital base was temporarily reinstated through tax year 2026; qualified manufacturers, emerging technology companies, small businesses, and cooperative housing corporations are exempt from it.⁹

Part 5: Fixed Dollar Minimum

The fixed dollar minimum is a flat amount tied to your New York receipts, ranging from $25 (receipts of $100,000 or less) up to $200,000 (receipts over $1 billion).¹⁰ Qualified New York manufacturers and qualified emerging technology companies use a reduced schedule topping out at $3,750.¹¹ This figure acts as a floor; every filer owes at least its bracket amount even if the income and capital bases produce less.

Part 6: Business Apportionment Factor

Part 6 is the longest section and the one most likely to get recomputed if filled in sloppily. Lines 1 through 54 break your receipts into categories (tangible property sales, real property receipts, rentals, royalties, digital products, financial instruments, broker-dealer activities, credit card processing, and aviation services), each with separate columns for New York and everywhere amounts. Enter receipts on the specific category lines even if all of them are New York receipts. Skipping straight to the total on line 55 is a common error that causes the Department to recompute the factor, sometimes at 100 percent.

Two sets of lines are category-restricted. Lines 31 through 37 are only for registered securities or commodities brokers and dealers. Lines 38 through 42 are only for corporations that issue or process credit cards. Everyone else leaves them blank.

The final factor on line 56 is New York receipts divided by total receipts, rounded to six decimal places.

Part 7: Tax Credits

List any credits you’re claiming here. Part 2 picks these up and applies them against the tax computed on the highest base.

Part 2: Balance Due or Overpayment

Part 2 is where the return resolves. Compare the business income base, capital base, and fixed dollar minimum, carry the highest forward, subtract credits from Part 7, then subtract estimated tax payments and any prior-year overpayment applied. The result is your balance due or refund. Part 2 is also where you report the mandatory first installment of next year’s estimated tax.

Modifications That Convert Federal Income to New York Income

The gap between federal taxable income and entire net income is a list of additions and subtractions set out in Tax Law Section 208.¹² Each modification carries its own code, and the Department flags lumping multiple items under one catchall code as a frequent cause of disallowed deductions.⁸

Common additions include state and local income taxes you deducted federally, the federal net operating loss deduction under IRC Section 172 (New York substitutes its own calculation), related-party royalty payments for intangibles unless an exception applies, and depreciation differences on assets subject to federal bonus or accelerated methods.

Common subtractions include the New York depreciation amount paired with any federal depreciation addback, interest on U.S. government obligations and other exempt income already in federal income, and qualifying income earned in a designated innovation hot spot.

Report subtractions as positive numbers. Do not use a minus sign on subtraction modifications or loss carryforwards; the form already treats those fields as reductions in the calculation.

How Apportionment Actually Works

New York uses customer-based sourcing. Receipts belong to New York when the customer receives the benefit of your goods or services in the state.¹³ For tangible goods, delivery destination controls. For services, the statute applies a hierarchy: first, where the customer received the benefit; second, the delivery destination; and if neither can be determined, prior-year ratios.

The factor is a single fraction based on receipts alone, not the three-factor property-payroll-sales formula used in some states. If New York customers generate 60 percent of your receipts, roughly 60 percent of your business income is taxed here. Where the standard formula distorts your actual New York activity, the Commissioner can adjust it, and you can request an adjustment.

The MTA Surcharge, if It Applies

If your corporation does business, employs capital, owns or leases property, maintains an office, or derives receipts from activity in the Metropolitan Commuter Transportation District, you owe an additional surcharge on Form CT-3-M.¹⁴ The MCTD covers twelve counties: New York, Bronx, Kings, Queens, Richmond, Dutchess, Nassau, Orange, Putnam, Rockland, Suffolk, and Westchester. Mark the yes/no box in the CT-3 header, then file CT-3-M alongside the main return if yes.

Deadlines, Extensions, and Estimated Tax

CT-3 is due three and a half months after the close of your fiscal year, which is April 15 for a calendar-year corporation.¹¹ When that date lands on a weekend or legal holiday, the deadline shifts to the next business day.

For more time, file Form CT-5 on or before the original due date for an automatic six-month extension.¹⁵ The extension covers filing only. You still have to pay your properly estimated tax with the CT-5, meaning either the full amount from last year’s return (if it covered 12 months) or at least 90 percent of this year’s final liability. Combined filers on CT-3-A use CT-5.3 instead.

If your franchise tax for the year will exceed $5,000, you owe quarterly estimated payments on Form CT-400.¹⁶ For calendar-year corporations, installments are due June 15, September 15, and December 15, with the mandatory first installment built into the prior year’s return. Underpayment triggers a penalty on each quarter’s shortfall.

Submitting and Paying

New York requires electronic filing for any corporation that uses approved e-file software to prepare the return and has broadband internet access, which captures most filers.¹⁷ File through commercial tax software that supports New York’s program or the Department’s Business Online Services portal. Extensions and estimated payments must also go electronically, even where the return itself cannot be e-filed.

Pay any balance due by ACH debit, credit card, or electronic check through the portal. Save the confirmation receipt; it is your proof of timely filing. The portal also shows payment history and refund status.

Errors That Trigger Notices

Beyond the apportionment, PNOLC/NOLD, and modification-code issues already called out, a few more mistakes come up often enough that the Department publishes them:⁸

Checking the qualified financial instrument election box without any assets marked to market under IRC Sections 475 or 1256.
Checking preferential-rate boxes in Part 1 Section A without actually qualifying.
Entering negative numbers in fields the form treats as positive values being subtracted.

Penalties and Amended Returns

Late filing without an extension costs 5 percent of unpaid tax per month or partial month, capping at 25 percent.¹⁸ Late payment carries its own separate penalty and interest from the original due date, so filing CT-5 on time but underpaying still produces interest on the shortfall. Persistent non-filing can end in dissolution by proclamation; reinstatement is more expensive and slower than just filing each year.

To amend, file a new CT-3 for the year in question, using that year’s version of the form, with the “Amended return” box on page 1 checked.¹¹ The general window is three years from the filing date or two years from the date tax was paid, whichever is later. If the IRS changes your federal taxable income, or you file an amended federal return, you have only 90 days from that federal change to file the corresponding amended New York return. Missing the 90-day window can forfeit any refund the federal adjustment would have produced in New York.

1
Cornell Law Institute. New York Code 20 NYCRR 1-2.1 – Domestic Corporations Subject to Tax
2
New York State Senate. New York Tax Law 209 – Imposition of Tax; Exemptions
3
New York State Department of Taxation and Finance. Instructions for Form CT-3-S New York S Corporation Franchise Tax Return
4
New York State Senate. New York Tax Law Article 33 – Franchise Taxes on Insurance Corporations
5
New York State Senate. New York Tax Code Article 9 – Corporation Tax
6
New York State Department of Taxation and Finance. Form CT-3 General Business Corporation Franchise Tax Return
7
New York State Department of Taxation and Finance. Instructions for Form CT-3 General Business Corporation Franchise Tax Return
8
New York State Department of Taxation and Finance. Tax Tips for Avoiding Common Filing Errors for General Business Corporations
9
New York State Department of Taxation and Finance. Corporate Franchise Tax: Tax Expenditure Estimates
10
New York State Department of Taxation and Finance. Definitions for Article 9-A Corporations
11
New York State Department of Taxation and Finance. Instructions for Form CT-3 General Business Corporation Franchise Tax Return
12
New York State Senate. New York Tax Law 208 – Definitions
13
New York State Senate. New York Tax Law 210-A – Apportionment
14
New York State Department of Taxation and Finance. Instructions for Form CT-3-A/BC Member’s Detail Report
15
New York State Department of Taxation and Finance. Instructions for Form CT-5 Request for Six-Month Extension to File
16
New York State Department of Taxation and Finance. Instructions for Form CT-400 Estimated Tax for Corporations
17
New York State Department of Taxation and Finance. Electronic Filing Mandate for Business Taxpayers
18
New York State Department of Taxation and Finance. Interest and Penalties